Wax-thread sewing-machine



(No Model.) 4 Sheets-Sheet 1.

G. A. STILES. WAX THREAD SEWING MAUHINE;

N, PETERS. Fholo-Lhhographqr. Walhingtam o. c.

No Model.) 4 Sheets-Sheet 2. G. A. STILES. WAX THREAD SEWING MACHINE.

.No. 423,456. PatentedMar. 18, I890.

u PETERS, Fhnlo-Limognpher. wumn 'm D c (No Model.) 4 r 4 Sheets-Sheet 3. G. A. STILES. WAX THREAD SEWING MACHINE.

Patented Mar. 18, 1890.

Merv 6076 %m/w& 5m.

(No Model.) 4 Shets-Sheet 4.

. G. A. STILES. WAX THREAD SEWING MACHINE.

Patented Mar. 18, 1890.

/4 A mung N. PH'ERS Pilolb-Lilhagmphun Wanhinatou, DC-

UNITED STATES PAT NT. OFFICE.

GEORGE A. STILES, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE NATIONAL SEWING MACHINE COMPANY, OF NEW HAVEN, CONNECTICUT.

WAX-TH READ SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 423,456, dated March 18, 1890.

Application filed September 10, 1883. Serial No. 285,031. (No model.)

To all whom it may concern:

Be it known that I, GEORGE A. slums, of Boston, county of Suffolk, State of Massa- 'chusetts, have invented an Improvement in \VaX-Thread Sewing-Machines, of which the following description, in connection with the accompanying drawings, is a specification,

like letters and figures on the drawings representing like parts.

This invention has for its object to im-' prove that class of machines employing a hooked needle which pulls a loop of thread through the material and presents it in position to be entered by a shuttle carrying a second thread, the shuttle having an oscillating movement in a circular race, my invention being intended as an improvement on the machine represented in United States application Serial No. 217,768. a

My invention in a sewing-machine'consists in the combination, with a shuttle and a v hooked needle, of a longitudinally-reciprobeing in position to give up the needle thread.

Fig. 2 is a left-hand side elevation of the machine shown in Fig. 1. Figs. 3 and 4. show, respectively, the cams Pand E developed. Fig. 5 is a detail to bereferred to of the sleeve and guide co-operating with the thread-carrier. Fig. 6 is a section in the line 00 Fig. 2. Fig. 7 is a front elevation of the machine shown in Fig. 1, the position of the parts being, however, somewhat changed. Fig. 8 is a sectional detail showing the devices for connecting the thread-finger and its operatinglever. Fig.9 is a partial front elevation, but enlarged, of th e shuttle-race, shuttle therein, and the cam for actuating it and the needle-bar, the Deedlebar being shown in dotted lines.

Fig. 10 is a partial plan view below the dotted line m, Fig. 1 and Figs. 11 to 19, inclusive,

are details in connection with the take-up and thread-clamping mechanism, showing the same in different positions.

The frame-work A and overhanging arm A, which are and may be of usual shape to sustain the working bearings, have suitable bearings, in which is placed the main shaft A having a series of cams B P D E and an eccentric F. The cam B has in it a suitable groove, in which is entered a roller or other stud curved at the lower end of a lever B, which at its upper end has a link B which at its front end is jointed (see Fig. 2) to the upper end of a lever Bipivoted at B to the head of the machine, the said leverat its lower end having a hub which receives in it loosely the shank of a fork 13 the said fork being restrained from longitudinal movement in the a said hub by a nut B The link 13 has on it two collars 2 3, (see Fig. 2,) and between the said collars the said link is surrounded loosely by anarm or block 4', extended from a short rod,5, (see Fig. 5,) I

the front end of the said rod being jointed by a screw 6 to an arm fast to the upper end of the rock-shaft B provided at its lower end with a slotted guide 13, in which is placed loosely a shoe 7, the slot in the saidguide and the said shoe being of dovetailed or equivalent shape in cross-section to' thus enable the shoe tobe supported in the guide in which it is to be reciprocated. -,;,The shoe 7 has connected to and depending from it the sleeve B into'which is entered and secured by a screw 8 the shank of the holder B in which is adjustably secured the thread-guide B The sleeve 13 referred to is grasped by the fork B, so that the latter as it is moved by the lever B is moved backward and forward in a horizontal plane, the shoe 7 at the same time being reciprocated in the guide B which guide for a part of the movement of the link B and lever B in each direction is oscillated, as when the guides 2 or 3 strike the arm or block 4., thus causing the guide B to impart to the sleeve and thread-guide B vibratory motion, the extent of which depends upon the extent to which the shaft or sleeve B is oscillated, and consequently the position of the shoe 7 in the slot of the guide B.

. guide by the devices described enables the thread-guide to carry the needlethread about the path of reciprocation of the needle, so as to present the thread to the hook of the needle b, to be taken thereby during the descent of the needle-bar H, the thread-guide stopping on its return motion, while the take-up operates with the eye of the thread-guide in line with the pulling-point of the take-up and' the point at which the, thread of the stitch leaves the material, thence returning to, its starting-point. (Do-operating with the threadguide B is a slack-thread-controlling finger a, it having its fulcrum on a stud a, set atan angle of about sixty degrees from the line of thelcenter'of the cam-shaft A such location of the stud a enabling the finger by its hooked loweriend'a toengageanddraw-the:

loop of thread between theeye of thethreadguide B :and the-work atan-angle of about thirty degrees with relation to :the direction" of :the' feed of the material bythe -needle,:the'= said fingera so-engaging and drawing =the,

thread ito 'be presented -to the lneedle-rwhiletthe needle b is -fully-up in the -material andis, feeding the latter over the work support or throat'N, the hook of theneedleb inits-de scent-engaging the thread between-the eye of the thread-guide B and :the said fingera; thus supplying the needle with suflicient thread to form a new loop without drawing the thread in the "hook of the needleduring'the. descent of the needle, thehookv of thefinger a engaging and retaining its hold upon the thread so drawn by it from the thread-guide until=the needle b completes its descent, thus preventing the loop from being twisted or turned: aside, as it wouldbe liabletodo if the said loop-were released by the-hook a of thei said'fingerbefore the needle I) completes its .descent. 'Bypreventing the twisting of the loopiin ;this=way-before it is entered by the a shuttle c, to be described, it is possible to makethe stitch-look alike on; the upper .andlower sides of't-he' work, which in leather -work'i-s a greatde'sideratum. 1

"llhekshankofthe' finger a isshown as having a curved-slot a concentric with a circle having as a center the-stud at, extended-from the awl-loarD through the'head of the ma chine, the circle being struckwhen the awlbaris inits lowest-position.

The'slot a inthe-shank of-the finger a re-. ceives in it a-block-nut 01, (see Fig. 8,) which is entered by a screw-studaithe shank of which'atthe outerside of thefinger a-issur-;

rounded by a-sleeve a, the said sleevehav-g ing pivoted to it by point-screws a the forked? lower end of a lever a slotted at 10, as shown? bestin Fig. 7, to receive thesaid stud 0, By loosening the screw 7 a in the block-nut a.

' the latter may be adjusted in the slot a to any desired position to thus enable-the finger-ct in its'movements to pullout a greater or a'less; length of thread, as stated, according to the, thickness of the stock being stitched, and as =which-enters a groove in A a cam. 0

the slot of is in the' arc of a circle, as described, it enables the hook a of the finger a to always approach the thread-guide to the same point, notwithstanding variations in the outward throw or pull of the said finger.

The finger a is pulled outwardly'by the action of thestud Win the upper end of the slot 10. The shaft A has faston it a gear G, which-through an intermediate gear H engages a gear I, fast on and rotating the needleactuat-ing shaft K, (shown mostly by dotted lines in Fig. 2,) the said shaft having at, its front enda cam-plateK, having a cam-groove '13,in which enters a roller or other stud (shown by dotted lines, Fig. 9) extended from the inner side of thene edle bar H ,carrying'the hookedlneedle b, the said needlebar :being preferablyiof dovetailed shape .in

cross-section and sliding in :a correspondingly-shaped =,gr0ove in a rocker po'st *l-l mounted to turn .on a stud H. ,-the-y ertica1 position of the said grocker-post in zlinetwith the awl d being insured ebyttwo adjusting screws b b screwed into a-rigid-partof the frame A and fastened eloosely through slots .in cars of'the-said rocker-post. v

ilj he rocker-posthas at itstupper :portion a slot 14, in which enters a slide-block :15,

mounted loosely on the outer 1 end of :the rockshaft' 0, pivoted atits ends on. conicalzpointed screws, the said rock-shaft havvingv ankarm, as 0 adj ustablysecure'd toiit by two-set-screws,

the said arm 0 enteringablock O ganda stud C having a loose block placeddn-a grooye V of a a rocking slotqarm 0 attached to arockshaft supported-:ina'hub C said IQCkqShtftarm. and 13100160 130 :and =includin'g'the said 'hub being common;toi theapplicationreferred to andiactingin =1ike manner to vibratezthe xrockeripost H which is substantiallyithe sa-me-sofar'as-its movingithe-needle to-feed the material as in the .said application. The rock-shaft carrying the arm C has :atits opposite end .an arniG ,,providedgwithda The shuttle c,.having its point cat one side oroffset, is placedminacircularracec andis-oscillated therein by adriveraplateic having dogs 16, which act againsttheshuttle to move it in usualmann er; The driver plate c is'fast to a short horizontalshaft 0 having faston it'a pinion c5, which'isengagedand oscillated by'a segmental rack a at the upper end. of an arm 0 attached .to-a rocking tion.

The eccentric vF, by or through theeccenjtric-strap F. and mock-shaft vFi-ztnd its .attached arm F actuates the awl-loar-D- v in the usual-manner. y

-.sleevecflhavingits .fulcrum 1 on I the shaftiK and deriving its motion from the cam D "through the link 'Df, the said vdriven-plate shaft a, pinion c and means for actuatingit being allsubstantially as in thesaidapplica- ThecamE receives in it a roller. or other 1 stud atthe upper end of a lever-E,.which,

by a link E is jointed-to the lower end of 1a a slotted bar 18 and a hook 19, (shown best.

in Fig. 10,) the said bar being slotted or provided with a hole at its inner end, which is V entered loosely by a pin 20 at the upper end of the lever E The hook'19 of the loopholder is directed toward the needle I), and is capable of being moved not only longitudinally, but also horizontally, as on the pin 20, across the path of reciprocation of the needle when the latter is down, as in Fig. 9, to thus enable the hook to engage the loop of needle-thread between the needle and the under side of the work, so that the point of the advancing shuttle 6 will enter the loop of needle-thread, the loop of needle-thread at such time being held by both the loopholder and the hook a of the finger a; As the loop-holder starts backward, the point of the shuttle havingcaught the loop, the 100s holder aids in carrying the loop of needlethread overthe broad part of the shuttle, after which the loop-holder is again moved horizontally and forward longitudinally to cast off theloop to be acted upon by the take-up. a

The cam Phas a groove in which is entered a roller or other stud carried at the lower end of a lever P, pivoted at P slotted at its upper end, as at 28, .the said slot receiving in it in an adjustable manner a bolt, as 29, which is also extended through a connecting-rod, as 30, which in turn (see Fig. 19) is jointed by like links 31 32, respectively, to the arms 33 and 34 of the take-up, the said arms being pivoted on a stud 35, made fast in the framework of the machine, the said stud also constituting the support for the tensiondevice 36, which is and may be'a wheel of usual construction. The arm 33 of the take-up has at its end a roll 37, and near its end at its rear side a pin 38, the said pin, when the two arms 33 and 34 are made to approach each other,

J respectively, from opposite directions by moving the connecting-rod 3O backward or to the right in Fig. 1, entering a notch, as 39 ,in a short forked arm 40, fast to a stud 41, which is extended through a hole 42 in the arm 34, the said stud 41, after passing through arm 34, having screwed upon it a thread-clamp, (shown as platc'43,) which is held in place by the check-nut 44. The thread-clamp 43 "is shown as provided with two shoulders 45 46, and the arm 34 has two shoulders 47 48. The forked arm 40 has a pin 49, and about the base of the stud 41' the said arm has a cam projection 50, whereas the inner side of the arm 34, next the forked arm, has a recess, as 51, (see Fig. 14,) into which may enter the said cam projection at a certain position of the parts as, forinstance, as in the position Fig. 1=at which time it is desired that the thread 15 be free in order that the shuttle while pass ing through the loopof thread'just previously drawn down by the needle I) may act upon the thread to draw from the usual wax-cup or thread-supply a small 'amount of thread which it is necessary to supply'to enable the shuttle to get through the; loop and at the same time aid in correctly setting the stitch,

'as to the'left in Fig. 1, which acts to separate the arms 33 and 34 'or to move the roller 37 away from the clamp 43, the pin 38 at such time acting to turn the forked arm 40 in such direction as to remove the cam 50 from and so as to stand across the space 51, such movement of the cam 40 causing the thread-clamp 43 to be movedtoward the face of the arm 34, so as to firmlyclamp thethread between them and positively prevent any thread from being taken from the thread-tension or wax-cup, (not shown,) while the arm l33,having the roll 37, acts on the thread to take up the shuttle-loop and finish the stitch. v It will be noticed herein that the threadclamp 43 is located between the tension: and the take-up roll, and as a result thereof the amount of thread which is subject to hard strain when setting the stitch is less in quantity than were the thread-clamp stationary on the machine and did not move with the arms of the take-up.

The shorter the bight of thread acted upon by the take-up the less the spring or stretching of the thread.

The bar 18 of the loop-spreader is free to slide longitudinally in a carriage 60, fitted to slide horizontally in guideways 61, forming part of the shuttle-race c thesaid carriage having a pin 62, which is embraced by the forked upper end of an arm 63 of arock-shaft 64, a second arm, as 65, of the said rock-shaft having a roller-stud 66, which enters a calm groove67 in the cam K, the said cam being of such shape as to slide the carriage 60 to the left (see Fig. 10) to enable the hook 19 of the loop-spreader to enter the loop held by theneedle, the loop-spreader then being drawn back and holding and spreading the loop, the carriage being thereafter moved to the right to enable the hook19 to disengage the loop, when the spreader is again moved forward into the position Fig. 10. p

The shoulders 45 46 and 47 48, co-operating with the pin 49, are to limit the eXten tof vi- 4 J I 3 42am device having a hook 19 and adapted to reciprocate in the said slidingcarriage atfrightf angles to the length of the stitch, andwith mechanism, substantially as described, to reciprocate the said loop-spreader in said ear riage and also to move said carriage and loopspreader bodily in the direction of the length:

} and for the purposes set forth.

of the stitch, substantially as described.

2. In a sewing-machine, the following in-; strumentalities, viz: an oscillating shuttle, a hooked needle, a horizontal slidingcarriage, a loop-spreadin g device therein having a hook- 19 and adapted to reciprocate in the saidcar riage at right angles to the length of the stitch,

mechanism to reciprocate the said loopspreader in said carriage, mechanism to move said carriage and loop-spreader bodily in the direction of the length of the stitch, and a finger a, having a hooked end a the said needle and spreader and finger acting to hold the loop of thread substantially as described While the shuttle is entering the said loop, as

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

GEO. A. STILES.

\Vitnesses:

G. W. GREGORY, HOWARD F. EATON. 

